arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1507.02460cond-mat.mes-hall
收藏

关于拓扑非平凡费米子系统族的一个定理

A theorem regarding families of topologically non-trivial fermionic systems

Bruno Mera, Miguel A. N. Araújo, Vítor R. Vieira

摘要:

我们引入了格点上费米子的哈密顿量,并证明了一个关于其拓扑性质的定理。我们确定的拓扑标准作为一个$\mathbb{Z}_2-$拓扑不变的$p(\textbf{k})$(的Pfronan多项式)。拓扑不变量不仅是第一个Chern数,而且是来自对偶概念的Pfronan多项式的符号。这样的哈密顿量可以描述非平凡的陈氏绝缘体,单带超导体或多轨道超导体。这些家庭的拓扑特征完全确定作为我们的定理的结果。给出了一些具体的模型实例,并计算了各种可能的拓扑不变量。

英文摘要:

We introduce a Hamiltonian for fermions on a lattice and prove a theorem regarding its topological properties. We identify the topological criterion as a $\mathbb{Z}_2-$ topological invariant $p(\textbf{k})$ (the Pfaffian polynomial). The topological invariant is not only the first Chern number, but also the sign of the Pfaffian polynomial coming from a notion of duality. Such Hamiltonian can describe non-trivial Chern insulators, single band superconductors or multiorbital superconductors. The topological features of these families are completely determined as a consequence of our theorem. Some specific model examples are explicitly worked out, with the computation of different possible topological invariants.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑